AVC-LAN Circuit (Telephone ECU Assy (Mayday ECU) )

AVC-LAN CIRCUIT (TELEPHONE ECU ASSY (MAYDAY ECU) - STEREO COMPONENT AMPLIFIER ASSY)

CIRCUIT DESCRIPTION

Each unit of the LEXUS navigation system connected to AVC-LAN (communication bus) communicates by transferring the signals from each switch.

When +B short and GND short occur in this AVC-LAN, LEXUS navigation system will not function normally as communication is discontinued.

In AVC-LAN, Multi-display assy becomes the communication master, and the radio receiver assy has enough resistance necessary for transmitting the communication.

The multi-display assy is connected between the navigation ECU and radio receiver assy, and LEXUS navigation system has the structure that makes communication impossible without the navigation ECU, multi-display assy or radio receiver assy.

Wiring Diagram:

Step 1:

INSPECTION PROCEDURE